Question

我需要处理Excel文件并将其内容POST到REST服务。我可以通过Apache POI加载Excel行并将其转换为JSON数组。但是，在POST到REST服务时，它因HTTP状态413而失败，因为由于Excel文件中的行数，POST主体太大。

Apache Camel中是否有办法限制REST服务的JSON输入大小并重复调用REST服务调用。请帮忙。

以下是Java DSL路由配置。

from("file:/excelfilelocation/inputexcel.xls")
        .bean(new ExcelConverter(), "processExcel") // Converts excel rows to ArrayList of model object
        .marshal().json(JsonLibrary.Jackson)
        .setHeader("Authorization", simple(apiKEY))
        .setHeader(Exchange.HTTP_METHOD, constant("POST"))
        .setHeader(Exchange.HTTP_URI, simple(API_URL))
        .setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
        .to(API_URL)
        .to("mock:finish");

由于POST主体内容长度较大而导致错误。

org.apache.camel.http.common.HttpOperationFailedException：HTTP 操作失败调用 https://test.com/api/v2/receipts与statusCode：的 413

Answer 1

您可以使用Splitter EIP拆分Excel条目，然后使用Aggregator EIP将它们收集到更易于管理的批次中，然后发送这些批次：

from("file:/excelfilelocation?fileName=inputexcel.xls")
    .bean(new ExcelConverter(), "processExcel")
    .split(body())
    .aggregate(constant(true), new GroupedBodyAggregationStrategy())
      .completionSize(100)
      .completionTimeout(1000)
      .marshal().json(JsonLibrary.Jackson)
      .setHeader("Authorization", simple(apiKEY))
      .setHeader(Exchange.HTTP_METHOD, constant("POST"))
      .setHeader(Exchange.HTTP_URI, simple(API_URL))
      .setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
      .to(API_URL);

以下是将行收集到列表中的聚合策略：

public class GroupedBodyAggregationStrategy extends AbstractListAggregationStrategy<Message> {

    @Override
    public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
        if (oldExchange == null) {
            // for the first time we must create a new empty exchange as the
            // holder, as the outgoing exchange
            // must not be one of the grouped exchanges, as that causes a
            // endless circular reference
            oldExchange = new DefaultExchange(newExchange);
        }
        return super.aggregate(oldExchange, newExchange);
    }

    @Override
    public Object getValue(Exchange exchange) {
        return exchange.getIn().getBody();
    }
}

Apache Camel - 拆分JSON数组并迭代地向REST服务调用POST

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